TY - CHAP
T1 - Mismatched filters for Doppler-sensitive active sonar pulses
AU - Pallaud, R.F.
AU - Atkins, P.R.
PY - 2011/1/1
Y1 - 2011/1/1
N2 - A technique used for designing radar poly-phase codes, is used to design mismatched filters for long-range active sonar systems, where transmit waveforms are Doppler-sensitive. The long ranges and operational scenarios involved mean that only single-ping operations are considered. The waveforms under consideration are long-duration Cox combs and sinusoidally frequency modulated (SFM) pulses, arbitrarily selected to occupy the frequency range 1 to 2 kHz. When used in conjunction with a matched filter, these waveforms offer an attractive Doppler resolution, but suffer from significant range sidelobes. The proposed mismatched filters attempt to improve their range resolution or lower their sidelobes across the zero-Doppler region of the range-Doppler domain. The designed cross-ambiguity functions achieve range sidelobes lower than 32.5 dB for the Cox comb, and 33.0 dB for the SFM pulse, as well as acceptable Doppler sidelobes at non-zero delays. This comes at a price of a signal-to-noise ratio (SNR) loss of 18.5 dB for the Cox comb, and 20.5 dB for the SFM pulse.
AB - A technique used for designing radar poly-phase codes, is used to design mismatched filters for long-range active sonar systems, where transmit waveforms are Doppler-sensitive. The long ranges and operational scenarios involved mean that only single-ping operations are considered. The waveforms under consideration are long-duration Cox combs and sinusoidally frequency modulated (SFM) pulses, arbitrarily selected to occupy the frequency range 1 to 2 kHz. When used in conjunction with a matched filter, these waveforms offer an attractive Doppler resolution, but suffer from significant range sidelobes. The proposed mismatched filters attempt to improve their range resolution or lower their sidelobes across the zero-Doppler region of the range-Doppler domain. The designed cross-ambiguity functions achieve range sidelobes lower than 32.5 dB for the Cox comb, and 33.0 dB for the SFM pulse, as well as acceptable Doppler sidelobes at non-zero delays. This comes at a price of a signal-to-noise ratio (SNR) loss of 18.5 dB for the Cox comb, and 20.5 dB for the SFM pulse.
UR - http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-84857499427&md5=37c55834b1b3ead10ee082fa161eb986
U2 - 10.1109/ICSIPA.2011.6144141
DO - 10.1109/ICSIPA.2011.6144141
M3 - Other chapter contribution
AN - SCOPUS:84857499427
SP - 150
EP - 155
BT - 2011 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2011
ER -